Strip out some unused cruft from exports

Ported from 1.5.x 39b355c6d3a0d5252c1c6e6aa474b84d5e1e008c

Signed-off-by: Frank Filz <ffilz@us.ibm.com>

Conflicts:

	src/include/nfs_exports.h
Fix some IPv6 compile issues

Ported from 1.5.x 24d98f405eb8968926abd3f7ac493f5fafed762e

Plus some additional fixes in 9p

Signed-off-by: Frank Filz <ffilz@us.ibm.com>